sendmail, dyndns, local mailer

### /etc/mail/sendmail.mc ###
# divert(-1)
# # $Id: sendmail.mc,v 1.18 2003/08/10 21:59:28 jmates Exp $
# #
# # Configuration for a sendmail daemon that accepts mail for a particular
# # host in a domain from the central mail server and proxy systems.
# # Outgoing mail will be passed to the central MX servers for the domain
# # by default.  Mail submitted on the command line is processed by
# # sendmail running with the submit.cf configuration, not sendmail.cf.
# #
# # See sendmail's cf/README file for documentation on how to adjust this
# # file to suit your needs.
# #
# # To build sendmail.cf from this file, configure the Makefile for the
# # system in question, then run 'make config reload' to rebuild the 
# # configuration files and restart Sendmail.
# divert(0)
# 
# dnl adjust following for system in question (darwin, linux, solaris2 are
# dnl common; see the cf/ostype directory for others).
# OSTYPE(`debian')
# 
# dnl increasing the log level allows one to debug various things
# dnl define(`confLOG_LEVEL', 25)
# 
# dnl disable aliases on clients by default
# undefine(`ALIAS_FILE')
# dnl keep both a vendor and a local aliases file for better manageability
# dnl define(`ALIAS_FILE', `MAIL_SETTINGS_DIR`'aliases,'`MAIL_SETTINGS_DIR`'aliases.local')
# dnl FEATURE(`redirect')
# 
# dnl disable .forward support by default to prevent regular users from
# dnl breaking mail routing
# define(`confFORWARD_PATH', `')
# 
# dnl Only allow user@example.org addresses.  Central mail servers
# dnl consequently need to handle all accounts for the domain.
# MASQUERADE_AS(`localhost.localdomain')
# MASQUERADE_DOMAIN(`otherhost.domain')
# dnl MASQUERADE_EXCEPTION(`lists.$m')
# 
# FEATURE(`allmasquerade')
# FEATURE(`masquerade_envelope')
# FEATURE(`masquerade_entire_domain')
# 
# FEATURE(`always_add_domain')
# 
# dnl send mail for other hosts through MX for domain
# define(`SMART_HOST', `mail1.telia.com')
# dnl alternative to SMART_HOST for open networks is to have a fallback
# dnl define(`confFALLBACK_MX', `')
# 
# 
# dnl some security options, aimed at machines that see light to 
# dnl meduim traffic.  Tweak to suit your site.
# define(`confCONNECTION_RATE_THROTTLE', `2')
# 
# dnl slow down username lookup scans.  May also want to patch sendmail
# dnl to drop the connection after X many BAD_RCPT to keep spammers
# dnl from consuming server resources:
# dnl http://lists.roaringpenguin.com/pipermail/mimedefang/2003-Jan...
# define(`confBAD_RCPT_THROTTLE', `3')
# 
# dnl prevent huge files being used as DoS attack
# define(`confMAX_MESSAGE_SIZE', `5242880')
# 
# dnl max number of children permitted to spawn, connections refused
# dnl past here.  prevents runaway server under DoS, might need to be
# dnl increased for a busy mail server
# dnl define(`confMAX_DAEMON_CHILDREN', `24')
# 
# dnl tightest security measures as easier to lax them later...
# define(`confPRIVACY_FLAGS', ``needmailhelo,needvrfyhelo,needexpnhelo,restrictqrun,nobodyreturn,noetrn'')
# 
# 
# DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=alliz.ath.cx' )
# 
# dnl set this to disable listening on port 587
# dnl FEATURE(`no_default_msa')
# 
# dnl enable this for IPv6 support
# dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA6, M=O')
# dnl DAEMON_OPTIONS(`Family=inet6, Name=MSA6, Port=587, M=O, M=E')
# dnl define(`confBIND_OPTS', `WorkAroundBrokenAAAA')
# 
# 
# dnl TLS configuration
# dnl disabled by default, as Sendmail must be compiled with STARTTLS support
# 
# dnl define(`CERT_DIR', `MAIL_SETTINGS_DIR`'certs')
# dnl define(`confCACERT', `CERT_DIR/cacert.pem')
# dnl define(`confCACERT_PATH', `CERT_DIR/CA')
# dnl define(`confSERVER_CERT', `CERT_DIR/host.cert')
# dnl define(`confSERVER_KEY',  `CERT_DIR/host.key')
# dnl define(`confCLIENT_CERT', `CERT_DIR/host.cert')
# dnl define(`confCLIENT_KEY',  `CERT_DIR/host.key')
# 
# dnl For TLS, the smmsp user will need read access to the confSERVER_KEY
# dnl file, which can be done with a chgrp smmsp and a chmod g+r on the file
# dnl plus the following.  Allow group writable directories due to lax
# dnl permissions on certain client OS (Mac OS X, for instance).
# define(`confDONT_BLAME_SENDMAIL', `GroupWritableDirPathSafe,GroupReadableKeyFile')
# 
# 
# dnl SASL configuration (for SMTP AUTH)
# dnl disabled by default, as Sendmail must be compiled with SASL support
# 
# dnl how folks can authenticate, and which methods are allowed to relay
# dnl define(`confAUTH_MECHANISMS', `GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')
# dnl TRUST_AUTH_MECH(`GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')
# dnl assumes sendmail compiled with _FFR_SASL_OPTS, disables
# dnl PLAIN and LOGIN over non-TLS links
# dnl define(`confAUTH_OPTIONS', `p')
# 
# 
# dnl turn off various protocols; SMTP only by default
# undefine(`UUCP_RELAY')
# undefine(`BITNET_RELAY')
# undefine(`DECNET_RELAY')
# undefine(`FAX_RELAY')
# FEATURE(`nouucp', `reject')
# 
# dnl for optional local machine names
# define(`confCW_FILE', `-o MAIL_SETTINGS_DIR`'local-host-names')
# FEATURE(`use_cw_file')
# 
# dnl optional support for trusted users (needed to support mailing list
# dnl software that munges the from addresses)
# define(`confCT_FILE', `-o MAIL_SETTINGS_DIR`'trusted-users')
# FEATURE(`use_ct_file')
# 
# FEATURE(`smrsh')
# 
# dnl FEATURE(`genericstable')
# dnl GENERICS_DOMAIN_FILE(`-o MAIL_SETTINGS_DIR`'generics-domains')
# 
# dnl FEATURE(`mailertable')
# 
# dnl FEATURE(`virtusertable')
# dnl VIRTUSER_DOMAIN_FILE(`-o MAIL_SETTINGS_DIR`'virtual-domains')
# dnl FEATURE(`virtuser_entire_domain')
# 
# FEATURE(`access_db')
# FEATURE(`blacklist_recipients')
# dnl FEATURE(`delay_checks', `friend')
# 
# dnl do not wait for ident
# define(`confTO_IDENT', `0')
# 
# dnl disable statistics if not using mailstats(8)
# define(`STATUS_FILE', `')
#
# define(`confDELIVERY_MODE', `queueonly')
# 
# dnl explicit procmail paths may be required on some systems
#  define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')
#  FEATURE(local_procmail)
# dnl FEATURE(`local_procmail', `/usr/bin/procmail', `procmail -Y -a $h -d $u') 
#  
#
#
#  
#  dnl MAILER(`procmail')dnl
#  dnl MAILER(`smtp')dnl
# 
O QueueDirectory=/var/spool/mqueue.in 
#
# LOCAL_CONFIG
# dnl only accept local mail, or that sent to our node name
# dnl  Cwlocalhost
# 
# LOCAL_RULESET
#  
#  MAILER(procmail)
#  MAILER(smtp)